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What is the resistance of a 4.2 m length of copper wire 1.9 mm in diameter? Express your answer to two significant figures and include the appropriate units.

Answer :

Explanation:

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Answer:

The resistance is 0.02484 Ω

Explanation:

we have the following data:

L = length = 4.2 m

D = diameter = 1.9 mm = 0.0019 m

p = the resistivity of copper = 1.68x10^-8 Ω*m

we calculate the area:

A = pi*r^2 = pi*(0.0019 m/2)^2 = 2.84x10^-6 m

resistance is given by:

R = (p*L)/A = ((1.68x10^-8 Ω*m)*(4.2))/2.84x10^-6 m = 0.02484 Ω

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